Nothing against Wylie, but back in the day...when I could run with the herd...I / we did tactical training with a couple of (you know the type) former SWAT / Special Forces / SEAL / Krav Maga types who showed up for the mandatory 5 mile, full-gear run wearing an extra 40 pounds. They were tough, no doubt.
But...the machine (human body) functions best, and performs best, and builds best, when the "engine" is at peak performance, which is cool, well-ventilated, and well-hydrated. When you start out overheated, or over-burdened, all you are doing is making the body work harder to find it's comfort zone. This, in the end, tends to take away from the benefits of strength, or endurance training.
Training, whether athletic or otherwise, which starts out with the body already stressed, is more geared towards mental toughness than improving physical performance. Been there, done that, and it has it's place, and it's benefits.
But for pure S&C, with an athletic focus...I'll take the guy who shows up in shorts and a t-shirt. He knows what he's there for, and what the goal is.
Go Vols.